Microchip Technology 25AA080A-I/SN

Overview

25AA080A-I/SN from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page size, and 1.8–5.5 V supply range. It features hardware write protection via WP pin, HOLD functionality for interrupt-safe bus suspension, and operates across -40°C to +85°C industrial temperature range in 8-lead SOIC package. Used for nonvolatile parameter storage in microcontroller-based embedded systems.

For engineers reviewing the 25AA080A-I/SN datasheet, 25AA080A-I/SN pinout, 25AA080A-I/SN application, or 25AA080A-I/SN equivalent, key selection criteria include VCC min (1.8 V), page write capability (16 bytes), endurance (1M cycles), data retention (>200 years), and SPI timing compliance at 10 MHz max clock under 4.5–5.5 V.

Technical Context

The 25AA080A-I/SN implements a standard SPI Mode 0,0/M1,1 interface with separate SI (data-in) and SO (data-out) lines, requiring CS, SCK, and optional HOLD/WP control. Its internal architecture includes a status register with WIP, WEL, BP0/BP1, and WPEN bits enabling configurable block write protection (none/1/4/1/2/all array).

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed internal write cycle (≤5 ms). Read supports sequential addressing with automatic address rollover at 03FFh. HOLD suspends ongoing transfers without resetting state, provided asserted while SCK is low.

Key Specifications

Pinout & Package

25AA080A-I/SN is packaged in 8-lead SOIC (SN) with 1.27 mm pitch, 4.90 mm × 6.00 mm body, and Pb-free RoHS-compliant construction. Pin 1 is marked with a notch or dot; package meets JEDEC MS-012AA standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPI EEPROM applications.

Compared with 25AA080A-I/SN, the 25LC080A-I/SN offers identical functionality at higher minimum voltage, while AT25080B-SSHL-T provides higher clock rate but lacks 1.8 V support and uses a non-Microchip command set-requiring firmware adaptation.

Availability

25AA080A-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 25AA080A-I/SN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA080A-I/SN belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-voltage, SPI-based nonvolatile storage in cost-sensitive embedded applications demanding high endurance and long data retention.

FAQ

What is the minimum supply voltage required for reliable operation of the 25AA080A-I/SN?

The 25AA080A-I/SN operates reliably down to 1.8 V across its full industrial temperature range (-40°C to +85°C). Below this threshold, DC characteristics such as VIH/VIL and AC timing margins are not guaranteed per DS21808D. The 25AA080A-I/SN is uniquely suited among 8 Kbit SPI EEPROMs for direct interface with 1.8 V logic families without level translation, making it ideal for ultra-low-power IoT edge nodes.

Does the 25AA080A-I/SN support page write operations, and what is the maximum number of bytes per page?

Yes, the 25AA080A-I/SN supports page write operations with a fixed 16-byte page size. Up to 16 bytes can be written in a single transaction, provided all addresses fall within the same physical page boundary (e.g., 0000h–000Fh, 0010h–001Fh). Attempting to cross a page boundary causes wraparound within the current page-not advancement to the next-so firmware must validate address alignment before initiating page writes.

How does hardware write protection work on the 25AA080A-I/SN, and what pins are involved?

Hardware write protection on the 25AA080A-I/SN is controlled jointly by the WP pin (Pin 3) and the WPEN bit (bit 7) in the Status Register. Protection activates only when WP is low AND WPEN = 1, disabling writes to the Status Register's nonvolatile bits (BP0, BP1, WPEN). Memory array writes remain enabled unless blocked by BP bits. The 25AA080A-I/SN defaults to WPEN = 0 at power-up, allowing initial Status Register configuration even with WP grounded.

What is the purpose of the HOLD pin on the 25AA080A-I/SN, and how must it be used correctly?

The HOLD pin (Pin 7) on the 25AA080A-I/SN pauses ongoing SPI communication without resetting the internal state, enabling the host MCU to service time-critical interrupts. To activate HOLD, it must be pulled low while SCK is low; releasing HOLD while SCK is low resumes transmission from the exact bit position. If asserted during SCK high, the function delays until the next SCK low-to-high transition. The 25AA080A-I/SN maintains CS assertion throughout the hold period.

Can the 25AA080A-I/SN be used in automotive applications requiring AEC-Q200 qualification?

No, the 25AA080A-I/SN is rated for Industrial temperature range (-40°C to +85°C) only and is not AEC-Q200 qualified. For automotive applications, Microchip offers the 25AA080A-E/SN variant (E-grade), specified for -40°C to +125°C and qualified to AEC-Q200 Rev D. Using the 25AA080A-I/SN in under-hood environments risks parametric failure outside its validated operating envelope; always verify ambient thermal profile against the I-grade specification before deployment.